斜风下斜拉-悬吊组合体系桥颤振性能研究  

Study on the flutter performance of cable-stayed-suspension hybrid bridges under skew wind

作　　者：张新军[1] 赵天娇 应赋斌 ZHANG Xinjun;ZHAO Tianjiao;YING Fubin(College of Civil Engineering,Zhejiang University of Technology,Hangzhou 310023,China)

机构地区：[1]浙江工业大学土木工程学院,浙江杭州310023

出　　处：《浙江工业大学学报》2023年第4期426-432,共7页Journal of Zhejiang University of Technology

基　　金：浙江省公益技术应用研究项目(LGF22E080018)。

摘　　要：为了解斜风作用下斜拉悬吊组合体系桥的颤振性能,采用考虑静风效应和全模态耦合影响的斜风下大跨度桥梁三维精细化颤振分析程序,以主跨1400 m的斜拉悬吊组合体桥设计方案为研究对象,分析了结构动力特性和斜风作用下结构的颤振稳定性,并揭示斜风和静风效应对斜拉悬吊组合体系桥颤振稳定性的影响。研究结果表明:斜拉悬索组合体系桥是长周期的大跨柔性结构,自振频率密集分布,模态耦合效应强,具有显著的多模态耦合颤振特点;斜拉悬索组合体系桥的颤振临界风速随着风偏角的增大呈现波动起伏变化特征,并非如斜风分解法所述呈单调递增的变化规律,且主要在斜风情况下达到最低值;斜风和静风效应均会降低斜拉悬索组合体系桥的颤振稳定性,且静风效应起主要作用;斜风和静风效应使颤振临界风速的平均降幅分别达到1.53%和9.83%,而斜风和静风的综合作用则进一步降低斜拉悬吊组合体系桥的颤振稳定性,降幅平均值达到了13.8%。因此,斜拉悬吊组合体系桥颤振分析必须综合考虑斜风和静风效应及其产生的不利影响。To understand the flutter performance of cable-stayed-suspension hybrid bridges under skew wind,by using a computational procedure of 3D refined flutter analysis of long-span bridges under skew wind,in which the aerostatic effect and full-mode coupling effect etc are fully considered,the dynamic characteristics and flutter stability of a cable-stayed-suspension hybrid bridge with a main span of 1400 m is numerically investigated under skew wind and the effects of skew wind and aerostatic effect on the flutter stability of the cable-stayed-suspension hybrid bridge are assessed.The results show that the cable-stayed-suspension hybrid bridge is a kind of long-span flexible structures with long fundamental periods,the natural frequencies distribute densely,and the modal coupling effect is strong,which has the characteristics of significant multimode coupling flutter.The flutter critical wind speed of the cable-stayed-suspension hybrid bridge fluctuates with the increase of wind yaw angle and usually reaches to the lowest value under the skew wind.The skew wind and the aerostatic effect reduce the flutter stability of the cable-stayed-suspension hybrid bridge and the aerostatic effect plays a major role.The average decrease rates of the flutter critical wind speed due to the skew wind and the aerostatic effect are 1.53%and 9.83%respectively.The combined effects of skew and static winds further degrade the flutter stability of the cable-stayed-suspension hybrid bridge and the decrease rate is 13.8%.Therefore,the effects of skew and static winds and their adverse effects must be considered comprehensively in the flutter analysis of cable-stayed-suspension hybrid bridges.

关 键 词：斜风 斜拉悬吊组合体系桥 颤振稳定性 动力特性 静风效应 

分 类 号：U448.25[建筑科学—桥梁与隧道工程]